sound/usb/6fire/midi.c

   1 /*
   2  * Linux driver for TerraTec DMX 6Fire USB
   3  *
   4  * Rawmidi driver
   5  *
   6  * Author:      Torsten Schenk <torsten.schenk@zoho.com>
   7  * Created:     Jan 01, 2011
   8  * Version:     0.3.0
   9  * Copyright:   (C) Torsten Schenk
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <sound/rawmidi.h>
  18
  19 #include "midi.h"
  20 #include "chip.h"
  21 #include "comm.h"
  22
  23 static void usb6fire_midi_out_handler(struct urb *urb)
  24 {
  25         struct midi_runtime *rt = urb->context;
  26         int ret;
  27         unsigned long flags;
  28
  29         spin_lock_irqsave(&rt->out_lock, flags);
  30
  31         if (rt->out) {
  32                 ret = snd_rawmidi_transmit(rt->out, rt->out_buffer + 4,
  33                                 MIDI_BUFSIZE - 4);
  34                 if (ret > 0) { /* more data available, send next packet */
  35                         rt->out_buffer[1] = ret + 2;
  36                         rt->out_buffer[3] = rt->out_serial++;
  37                         urb->transfer_buffer_length = ret + 4;
  38
  39                         ret = usb_submit_urb(urb, GFP_ATOMIC);
  40                         if (ret < 0)
  41                                 snd_printk(KERN_ERR PREFIX "midi out urb "
  42                                                 "submit failed: %d\n", ret);
  43                 } else /* no more data to transmit */
  44                         rt->out = NULL;
  45         }
  46         spin_unlock_irqrestore(&rt->out_lock, flags);
  47 }
  48
  49 static void usb6fire_midi_in_received(
  50                 struct midi_runtime *rt, u8 *data, int length)
  51 {
  52         unsigned long flags;
  53
  54         spin_lock_irqsave(&rt->in_lock, flags);
  55         if (rt->in)
  56                 snd_rawmidi_receive(rt->in, data, length);
  57         spin_unlock_irqrestore(&rt->in_lock, flags);
  58 }
  59
  60 static int usb6fire_midi_out_open(struct snd_rawmidi_substream *alsa_sub)
  61 {
  62         return 0;
  63 }
  64
  65 static int usb6fire_midi_out_close(struct snd_rawmidi_substream *alsa_sub)
  66 {
  67         return 0;
  68 }
  69
  70 static void usb6fire_midi_out_trigger(
  71                 struct snd_rawmidi_substream *alsa_sub, int up)
  72 {
  73         struct midi_runtime *rt = alsa_sub->rmidi->private_data;
  74         struct urb *urb = &rt->out_urb;
  75         __s8 ret;
  76         unsigned long flags;
  77
  78         spin_lock_irqsave(&rt->out_lock, flags);
  79         if (up) { /* start transfer */
  80                 if (rt->out) { /* we are already transmitting so just return */
  81                         spin_unlock_irqrestore(&rt->out_lock, flags);
  82                         return;
  83                 }
  84
  85                 ret = snd_rawmidi_transmit(alsa_sub, rt->out_buffer + 4,
  86                                 MIDI_BUFSIZE - 4);
  87                 if (ret > 0) {
  88                         rt->out_buffer[1] = ret + 2;
  89                         rt->out_buffer[3] = rt->out_serial++;
  90                         urb->transfer_buffer_length = ret + 4;
  91
  92                         ret = usb_submit_urb(urb, GFP_ATOMIC);
  93                         if (ret < 0)
  94                                 snd_printk(KERN_ERR PREFIX "midi out urb "
  95                                                 "submit failed: %d\n", ret);
  96                         else
  97                                 rt->out = alsa_sub;
  98                 }
  99         } else if (rt->out == alsa_sub)
 100                 rt->out = NULL;
 101         spin_unlock_irqrestore(&rt->out_lock, flags);
 102 }
 103
 104 static void usb6fire_midi_out_drain(struct snd_rawmidi_substream *alsa_sub)
 105 {
 106         struct midi_runtime *rt = alsa_sub->rmidi->private_data;
 107         int retry = 0;
 108
 109         while (rt->out && retry++ < 100)
 110                 msleep(10);
 111 }
 112
 113 static int usb6fire_midi_in_open(struct snd_rawmidi_substream *alsa_sub)
 114 {
 115         return 0;
 116 }
 117
 118 static int usb6fire_midi_in_close(struct snd_rawmidi_substream *alsa_sub)
 119 {
 120         return 0;
 121 }
 122
 123 static void usb6fire_midi_in_trigger(
 124                 struct snd_rawmidi_substream *alsa_sub, int up)
 125 {
 126         struct midi_runtime *rt = alsa_sub->rmidi->private_data;
 127         unsigned long flags;
 128
 129         spin_lock_irqsave(&rt->in_lock, flags);
 130         if (up)
 131                 rt->in = alsa_sub;
 132         else
 133                 rt->in = NULL;
 134         spin_unlock_irqrestore(&rt->in_lock, flags);
 135 }
 136
 137 static struct snd_rawmidi_ops out_ops = {
 138         .open = usb6fire_midi_out_open,
 139         .close = usb6fire_midi_out_close,
 140         .trigger = usb6fire_midi_out_trigger,
 141         .drain = usb6fire_midi_out_drain
 142 };
 143
 144 static struct snd_rawmidi_ops in_ops = {
 145         .open = usb6fire_midi_in_open,
 146         .close = usb6fire_midi_in_close,
 147         .trigger = usb6fire_midi_in_trigger
 148 };
 149
 150 int __devinit usb6fire_midi_init(struct sfire_chip *chip)
 151 {
 152         int ret;
 153         struct midi_runtime *rt = kzalloc(sizeof(struct midi_runtime),
 154                         GFP_KERNEL);
 155         struct comm_runtime *comm_rt = chip->comm;
 156
 157         if (!rt)
 158                 return -ENOMEM;
 159
 160         rt->chip = chip;
 161         rt->in_received = usb6fire_midi_in_received;
 162         rt->out_buffer[0] = 0x80; /* 'send midi' command */
 163         rt->out_buffer[1] = 0x00; /* size of data */
 164         rt->out_buffer[2] = 0x00; /* always 0 */
 165         spin_lock_init(&rt->in_lock);
 166         spin_lock_init(&rt->out_lock);
 167
 168         comm_rt->init_urb(comm_rt, &rt->out_urb, rt->out_buffer, rt,
 169                         usb6fire_midi_out_handler);
 170
 171         ret = snd_rawmidi_new(chip->card, "6FireUSB", 0, 1, 1, &rt->instance);
 172         if (ret < 0) {
 173                 kfree(rt);
 174                 snd_printk(KERN_ERR PREFIX "unable to create midi.\n");
 175                 return ret;
 176         }
 177         rt->instance->private_data = rt;
 178         strcpy(rt->instance->name, "DMX6FireUSB MIDI");
 179         rt->instance->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
 180                         SNDRV_RAWMIDI_INFO_INPUT |
 181                         SNDRV_RAWMIDI_INFO_DUPLEX;
 182         snd_rawmidi_set_ops(rt->instance, SNDRV_RAWMIDI_STREAM_OUTPUT,
 183                         &out_ops);
 184         snd_rawmidi_set_ops(rt->instance, SNDRV_RAWMIDI_STREAM_INPUT,
 185                         &in_ops);
 186
 187         chip->midi = rt;
 188         return 0;
 189 }
 190
 191 void usb6fire_midi_abort(struct sfire_chip *chip)
 192 {
 193         struct midi_runtime *rt = chip->midi;
 194
 195         if (rt)
 196                 usb_poison_urb(&rt->out_urb);
 197 }
 198
 199 void usb6fire_midi_destroy(struct sfire_chip *chip)
 200 {
 201         kfree(chip->midi);
 202         chip->midi = NULL;
 203 }